President Trump's first month in the White House has been a chaotic mess. Between National Security Adviser Michael Flynn's ouster to the ill-advised and ineptly managed travel ban, Trump's critics already have reason to feel vindicated.But if the president has been everything his skeptics feared, Defense Secretary Jim Mattis has been everything they could have wished for.When Mattis was tapped by Trump, liberals and conservatives alike hoped the retired Marine Corps general and former commander of U.S.